516643389 has 12 divisors (see below), whose sum is σ = 746682300. Its totient is φ = 344235264.

The previous prime is 516643373. The next prime is 516643399. The reversal of 516643389 is 983346615.

It can be written as a sum of positive squares in 2 ways, for example, as 305900100 + 210743289 = 17490^2 + 14517^2 .

It is not a de Polignac number, because 516643389 - 2⁴ = 516643373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516643339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1807 + ... + 32195.

It is an arithmetic number, because the mean of its divisors is an integer number (62223525).

Almost surely, 2^516643389 is an apocalyptic number.

It is an amenable number.

516643389 is a deficient number, since it is larger than the sum of its proper divisors (230038911).

516643389 is a wasteful number, since it uses less digits than its factorization.

516643389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32284 (or 32281 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 516643389 is about 22729.7907821432. The cubic root of 516643389 is about 802.4111573701.

The spelling of 516643389 in words is "five hundred sixteen million, six hundred forty-three thousand, three hundred eighty-nine".